Study of the 15N(p,γ)16O at LUNA

The 15N(p,γ)16O reaction links the first CNO cycle with the second one allowing the production of the oxygen and fluorine isotopes during the hydrogen burning in novae and AGB and RGB stars. In recent years, this reaction has been studied deeply by LUNA (Laboratory for Underground Nuclear Astrophysics). As a matter of fact three different experiments have been run to measure the 15N(p,γ)16O S factor down to the energy of the novae and ABG hydrogen burning reaching for the first time the 72.8 keV in the center of mass. In this contribution the results of the first two experiments are summarized and the results of the recently performed experiment, which is dedicated to the study at very low energies, are presented.